On a phone, when you scroll, it automatically hides the address bar and everything on it, to go 'full-screen'. I would love this on my laptop. That when I scroll, or even just sit on a webpage for a moment, the URL bar will smoothly transition into being 'hidden'. I want to be clear: I do NOT want to use the fullscreen, CTRL + F11 function, because then my Windows task bar is not accessible. Fullscreen browsing and a hidden task bar are currently not compatible. I have a userChrome.css file that gets the job done, but I would like official Firefox support!